EXCLUSIVE: For years last decade, miniseries were an essential part of TNT’s programming mix with such projects as Into The West, Salem’s Lot and The Company. As the genre lost popularity, TNT, like many other networks, pulled away from longform, cutting back on original movies and minis. Miniseries have enjoyed a comeback in the past couple of years, following the success of History’s Hatfields & McCoys. TNT is joining the trend withOne Giant Leap, a four-hour event miniseries about the life of NASA astronaut Neil Armstrong who became the first man to walk on the moon.

The project, now in development, is based on Leon Wagener’s book. The mini will be written by Al Reinert, who co-penned the movie Apollo 13 as well as two episodes of Tom Hanks’ follow-up moon exploration HBO miniseries From The Earth To The Moon — including one about Armstrong (played by Scandal‘s Tony Goldwyn), Buzz Aldrin and Michael Collins preparing for their Apollo 11 mission in 1969.

eOne Television is producing One Giant Leap, with the company’s John Morayniss and Michael Rosenberg serving as executive producers alongside Reinert and Kevin Cleary of Pooka Entertainment. Patti Vasquez of Pooka Entertainment and Josh Morris of Content House co-executive produce. Guy Oseary is a producer.